Malicious PDF — malware analysis report

Static analysis result for SHA-256 037704aa3ff4bfa0…

MALICIOUS

PDF

91.9 KB Created: 2021-06-29 16:47:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: f761b55ae5276a2445eb9663e4adb675 SHA-1: aba5c8e914c21c6af400910b3ee139a742bfab71 SHA-256: 037704aa3ff4bfa0360318969b6bffff9761c15186791f415bb78c94f17fbce5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm with multiple URLs hosted on compromised WordPress sites, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were explicitly extracted, the nature of the link farm and the detection results point towards a malicious PDF designed to lure users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://dipinkrishna.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad05492f3b2---laxusemukimodomozamari.pdf
    • http://ankamet.com/userfiles/file/wipexoxomevadeturunixe.pdf
    • https://www.nrlandscapes.co.uk/wp-content/plugins/super-forms/uploads/php/files/3d3762802b2595ddbedc50da4c02c285/38042684603.pdf
    • https://retentionstudentexperience.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076d6396d73f---fotusasajigerojikid.pdf
    • http://verdantnorwich.com/clients/3/30/306756bb587dffcd11ca74610d845a16/File/35852736873.pdf
    • https://regenerativetherapyforpain.com/wp-content/plugins/super-forms/uploads/php/files/ebcb9a135de42b92a3a5ca3ef5d9a152/54882140809.pdf
    • http://frederickfollows.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160be967dd339e---78151436429.pdf
    • http://xetaihyundai.net/upload/files/siwexadotopujumel.pdf
    • https://www.darrellstuckey.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c8511be3c7---jovazagavagupifa.pdf
    • http://rocb-ap.org/file_media/file_image/file/22894777595.pdf
    • http://www.fullmooneye.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4620b8eb47---65902927009.pdf
    • http://nuyewrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/bd7c917fceeba02a983dde4e9c28ab0d/32700457691.pdf
    • http://www.sparkprototypes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9f684bf05b---30452769452.pdf
    • http://vksraja.in/fckeditor/upload/file/risufadirobukowiwisor.pdf
    • https://beaufortbond.com/wp-content/plugins/super-forms/uploads/php/files/b745d5aa5940510202e37ff5f0fcbfc3/24518978657.pdf
    • https://webhostmurah.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609059dbb28f7---46602952619.pdf
    • https://dezsredstvompx.ru/wp-content/plugins/super-forms/uploads/php/files/d98947246a604ea65dfa19663f696c7e/65788263894.pdf
    • http://brainbond.ro/userfiles/file/57089038058.pdf
    • http://18554080.com/userfiles/file/83733478991.pdf
    • http://highlandhighclassof1962.com/clients/c/c3/c330a44b04b080977bf299ea430a317d/File/fuberixaxaretesezetu.pdf
    • http://dancephoto.ru/userfiles/files/buvumusasiboronobajiwobar.pdf
    • http://clinicacomciencia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160725456ce3c2---71760934497.pdf
    • https://unitjaya.com/contents//files/mugolejuxukivixuzasow.pdf
    • https://tocgia247.com/wp-content/plugins/super-forms/uploads/php/files/564jelapmcv36n91ka1i0u9k8u/84352411538.pdf
    • http://sl-light.ru/design/img/upload/file/59792224010.pdf
    • https://outsourcedbackoffice.co.uk/wp-content/plugins/super-forms/uploads/php/files/111cd2e4670651cd0b48563232ddec99/17325554581.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=app+to+watch+indian+web+series+free
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010320.bin
4a135783dd6f661e4bf40436c195a6ae743d30fc8385a0bbb3aef17b13590316		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10320 17464 bytes
font_01_sfnt_off000130d2.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x130D2 16792 bytes
font_02_sfnt_off000148e9.bin
b1a2e866f81d6a7f03a3c5820903ae3dc44511f710d9b8cd7a5bc4f3dc0f1257		 pdf-font-stream PDF embedded font (sfnt) at offset 0x148E9 10880 bytes

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